01:36 <awang> egg|phone|egg: Have you tried building Principia on macOS recently?

01:37 <awang> I'm getting linker errors

01:38 <awang> I'll get you thte error messages once this rebuild fails

01:43 <awang> Undefined symbols for architecture x86_64:

01:43 <awang> "google::FlagRegisterer::FlagRegisterer<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >(char const*, char const*, char const*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*)"

01:43 <awang> Referenced from a few libglog functions

01:49 <awang> And interestingly, there are no references to FlagRegisterer anywhere in the deps/ folder

01:51 <awang> Wait

01:51 <awang> Never mind

01:52 <awang> Apparently I need to do something about my search paths

15:02 <egg|zzz|egg> !tell gregroxmun will slippist-1 still work with 1.3.1 after the update, considering that it will require kopernicus expansions? people might want to use it with RO what with the large Δv

15:02 <Qboid> egg|zzz|egg: I'll redirect this as soon as they are around.

15:17 <GH> [Principia] pleroy closed pull request #1857: Alignments of planets (master...Views) https://git.io/vh1kj

17:13 <GregroxMun> hey

17:13 <Qboid> GregroxMun: egg|zzz|egg left a message for you in #principia [16.06.2018 15:02:49]: "will slippist-1 still work with 1.3.1 after the update, considering that it will require kopernicus expansions? people might want to use it with RO what with the large Δv"

17:13 <GregroxMun> KopX is available on 1.3.1

17:13 <GregroxMun> (I personally prefer SMURFF, which is more or less version independant, for getting realistic performance out of my RSS rockets)

17:13 <GregroxMun> (mainly because RO is a big ol' hassle!)

17:14 <GregroxMun> can I get the current version of the TRAPPIST-1 patch?

17:14 <GregroxMun> I really would like to test the stability of trojan asteroids

17:15 <GregroxMun> I assume I will have to be careful about how I place the trojans?

17:16 <GregroxMun> like, I assume I can't just put them at the semimajoraxis of the trojan-parent, because it will be orbiting slightly faster

17:17 <GregroxMun> My reason isn't just that of gameplay, I'd really like to know how well it works for a story that I'd considered writing in the TRAPPIST-1 system, which kind of requires a good amount of asteroids to work

17:19 <GregroxMun> though then again, if asteroids are rare but not totally absent, it could be more interesting.

17:24 <egg|zzz|egg> GregroxMun: wait how are you implementing your asteroids

17:24 <egg|zzz|egg> are they stock asteroids, or celestial bodies?

17:25 <GregroxMun> I was thinking I'd do stock asteroid spawner

17:25 <GregroxMun> you can specify a specific SMA

17:25 <egg|zzz|egg> ok that's fine

17:25 <egg|zzz|egg> the latter won't work with our patch because they'd need a gravity model etc.

17:25 <GregroxMun> right

17:25 <GregroxMun> I figured as much

17:25 <egg|zzz|egg> GregroxMun: thing is that they are very likely not stable anywhere

17:25 <GregroxMun> well I understand and agree with that hypothesis

17:25 <GregroxMun> but I would very much like to test it

17:26 <egg|zzz|egg> KSP isn't really the best tool to test it because long-term simulations with it are clumsy though

17:26 <GregroxMun> ok

17:26 <egg|zzz|egg> I can send you an updated config if you want

17:26 <GregroxMun> do please

17:27 <GregroxMun> do you have a better tool that I can use (preferably without a massive learning curve)

17:27 <egg|zzz|egg> no

17:27 <egg|zzz|egg> :-p

17:27 <GregroxMun> no period or no without a massive learning curve?

17:28 <egg|zzz|egg> I mean with a massive learning curve you can always use our libraries

17:28 <egg|zzz|egg> that works

17:28 <egg|zzz|egg> GregroxMun: https://hastebin.com/ageniqutan.pl this is the modified trappist_gravity_model_slippist1.cfg

17:28 <GregroxMun> thank

17:29 <egg|zzz|egg> GregroxMun: you also need to modify trappist_gravity_model.cfg and the initial state file, changing name = Trappist-1 to name = Sun

17:29 <GregroxMun> ok

17:32 <egg|zzz|egg> (we still need to tune the radii etc. but this should at least not crash which is all you need to look at stability

17:32 <egg|zzz|egg> stabbity

19:14 <GregroxMun> egg

19:14 <GregroxMun> https://i.imgur.com/GVohDJC.png

19:15 <GregroxMun> how would you calculate j2 for an oblate planet like this?

19:17 <GregroxMun> (j2 is related to oblateness, right?)

19:32 <egg|zzz|egg> yeah but that things seems prolate more than oblate

19:33 <GregroxMun> that's just the angle man

19:33 <GregroxMun> it's a proper oblate spheroid

19:33 <GregroxMun> we're looking edge on

19:34 <GregroxMun> https://i.imgur.com/m8zxVKN.png

19:34 <GregroxMun> another view

20:13 <egg|zzz|egg> GregroxMun: well, I don't know how to compute J2, ask UmbralRaptop

20:16 <UmbralRaptop> Spherical harmonics?

20:18 <UmbralRaptop> I'm afraid I don't know, and would need to look things up.